https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95677
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |lto, wrong-code Component|lto |c++ Version|lto |10.1.0 CC| |hubicka at gcc dot gnu.org, | |jason at gcc dot gnu.org, | |nathan at gcc dot gnu.org --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- It's more likely the GENERIC / cgraph output by the C++ frontend is not correct and works by accident without LTO. Initial symbol table: Initial Symbol table: int {anonymous}::xx/3 (int {anonymous}::xx) @0x7f615d2d8180 Type: variable Visibility: external References: Referring: _ZN12_GLOBAL__N_13fooEv/0 (write) Availability: not-ready Varpool flags: main/2 (int main()) @0x7f615d421168 Type: function definition analyzed Visibility: force_output no_reorder public Aux: @0x37a5000 References: int {anonymous}::xx/1 (write) Referring: Function flags: body Called by: Calls: int {anonymous}::xx/1 (int {anonymous}::xx) @0x7f615d2d8100 Type: variable definition analyzed Visibility: force_output no_reorder Aux: @0x7f615d421168 References: Referring: main/2 (write) Availability: not-ready Varpool flags: initialized _ZN12_GLOBAL__N_13fooEv/0 (void {anonymous}::foo()) @0x7f615d421000 Type: function definition analyzed Visibility: force_output no_reorder Aux: @0x7f615d2d8100 References: int {anonymous}::xx/3 (write) Referring: Function flags: body Called by: Calls: where you can see there are actually two 'xx' objects and the C++ FE takes it up to the linker/assembler to resolve them. But the symtab code does not include such "resolving" step.